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    image image image

    Visualizing large vector datasets with lonboard

    This notebook demonstrates how to visualize large vector datasets with lonboard. Please note that lonboard does not support Visual Studio Code's interactive notebook yet. You will need to run this notebook in Jupyter Notebook or JupyterLab.

    Uncomment the following line to install leafmap if needed.

    In [1]:
    Copied!
    # %pip install -U leafmap lonboard
    
    # %pip install -U leafmap lonboard
    In [2]:
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    import leafmap.deckgl as leafmap
    import geopandas as gpd
    import ipywidgets as widgets
    
    import leafmap.deckgl as leafmap import geopandas as gpd import ipywidgets as widgets

    Download sample datasets.

    In [3]:
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    url = "https://open.gishub.org/data/duckdb/nyc_data.zip"
    leafmap.download_file(url, unzip=True)
    
    url = "https://open.gishub.org/data/duckdb/nyc_data.zip" leafmap.download_file(url, unzip=True)
    Downloading...
    From: https://open.gishub.org/data/duckdb/nyc_data.zip
    To: /home/runner/work/leafmap/leafmap/docs/notebooks/nyc_data.zip
    
      0%|          | 0.00/8.73M [00:00<?, ?B/s]
    100%|██████████| 8.73M/8.73M [00:00<00:00, 309MB/s]
    
    
    Extracting files...
    
    Out[3]:
    '/home/runner/work/leafmap/leafmap/docs/notebooks/nyc_data.zip'

    Create an interactive map.

    In [4]:
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    m = leafmap.Map(center=[20, 0], zoom=1.2)
    m
    
    m = leafmap.Map(center=[20, 0], zoom=1.2) m

    Add GeoDataFrame.

    In [5]:
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    streets = gpd.read_file("nyc_streets.shp")
    m.add_gdf(streets, zoom_to_layer=True, pickable=True, get_width=5)
    
    streets = gpd.read_file("nyc_streets.shp") m.add_gdf(streets, zoom_to_layer=True, pickable=True, get_width=5)

    Add any vector format supported by GeoPandas.

    In [6]:
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    m.add_vector("nyc_subway_stations.shp", get_radius=10, get_fill_color=[255, 0, 0, 180])
    
    m.add_vector("nyc_subway_stations.shp", get_radius=10, get_fill_color=[255, 0, 0, 180])

    Change layer properties.

    In [7]:
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    layer = m.layers[-1]
    layer.get_fill_color = [0, 0, 255, 255]
    
    layer = m.layers[-1] layer.get_fill_color = [0, 0, 255, 255]

    Interactive widgets.

    In [8]:
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    color = widgets.ColorPicker(value="red", description="Color")
    width = widgets.IntSlider(min=1, max=100, value=10, description="Radius")
    hbox = widgets.HBox([color, width])
    
    color = widgets.ColorPicker(value="red", description="Color") width = widgets.IntSlider(min=1, max=100, value=10, description="Radius") hbox = widgets.HBox([color, width])
    In [9]:
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    widgets.dlink((color, "value"), (layer, "get_fill_color"))
    widgets.dlink((width, "value"), (layer, "get_radius"))
    
    widgets.dlink((color, "value"), (layer, "get_fill_color")) widgets.dlink((width, "value"), (layer, "get_radius"))
    Out[9]:
    <traitlets.traitlets.directional_link at 0x7f1d4beca0f0>
    In [10]:
    Copied!
    hbox
    
    hbox
    In [11]:
    Copied!
    m
    
    m
    2024-09-01 2021-06-10
    Copyright © 2021 - 2024 Qiusheng Wu
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